granicus.if.org Git - postgresql/blob - src/include/parser/parse_coerce.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * parse_coerce.h
   4  *      Routines for type coercion.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL: pgsql/src/include/parser/parse_coerce.h,v 1.76 2008/07/30 17:05:05 tgl Exp $
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PARSE_COERCE_H
  15 #define PARSE_COERCE_H
  16
  17 #include "parser/parse_node.h"
  18
  19
  20 /* Type categories (see TYPCATEGORY_xxx symbols in catalog/pg_type.h) */
  21 typedef char TYPCATEGORY;
  22
  23 /* Result codes for find_coercion_pathway */
  24 typedef enum CoercionPathType
  25 {
  26         COERCION_PATH_NONE,                     /* failed to find any coercion pathway */
  27         COERCION_PATH_FUNC,                     /* apply the specified coercion function */
  28         COERCION_PATH_RELABELTYPE,      /* binary-compatible cast, no function */
  29         COERCION_PATH_ARRAYCOERCE,      /* need an ArrayCoerceExpr node */
  30         COERCION_PATH_COERCEVIAIO       /* need a CoerceViaIO node */
  31 } CoercionPathType;
  32
  33
  34 extern bool IsBinaryCoercible(Oid srctype, Oid targettype);
  35 extern bool IsPreferredType(TYPCATEGORY category, Oid type);
  36 extern TYPCATEGORY TypeCategory(Oid type);
  37
  38 extern Node *coerce_to_target_type(ParseState *pstate,
  39                                           Node *expr, Oid exprtype,
  40                                           Oid targettype, int32 targettypmod,
  41                                           CoercionContext ccontext,
  42                                           CoercionForm cformat);
  43 extern bool can_coerce_type(int nargs, Oid *input_typeids, Oid *target_typeids,
  44                                 CoercionContext ccontext);
  45 extern Node *coerce_type(ParseState *pstate, Node *node,
  46                         Oid inputTypeId, Oid targetTypeId, int32 targetTypeMod,
  47                         CoercionContext ccontext, CoercionForm cformat);
  48 extern Node *coerce_to_domain(Node *arg, Oid baseTypeId, int32 baseTypeMod,
  49                                  Oid typeId,
  50                                  CoercionForm cformat, bool hideInputCoercion,
  51                                  bool lengthCoercionDone);
  52
  53 extern Node *coerce_to_boolean(ParseState *pstate, Node *node,
  54                                   const char *constructName);
  55 extern Node *coerce_to_specific_type(ParseState *pstate, Node *node,
  56                                                 Oid targetTypeId,
  57                                                 const char *constructName);
  58
  59 extern Oid      select_common_type(List *typeids, const char *context);
  60 extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
  61                                           Oid targetTypeId,
  62                                           const char *context);
  63
  64 extern bool check_generic_type_consistency(Oid *actual_arg_types,
  65                                                            Oid *declared_arg_types,
  66                                                            int nargs);
  67 extern Oid enforce_generic_type_consistency(Oid *actual_arg_types,
  68                                                                  Oid *declared_arg_types,
  69                                                                  int nargs,
  70                                                                  Oid rettype,
  71                                                                  bool allow_poly);
  72 extern Oid resolve_generic_type(Oid declared_type,
  73                                          Oid context_actual_type,
  74                                          Oid context_declared_type);
  75
  76 extern CoercionPathType find_coercion_pathway(Oid targetTypeId,
  77                                           Oid sourceTypeId,
  78                                           CoercionContext ccontext,
  79                                           Oid *funcid);
  80 extern CoercionPathType find_typmod_coercion_function(Oid typeId,
  81                                                           Oid *funcid);
  82
  83 #endif   /* PARSE_COERCE_H */